Excavator tooth assembly for earth moving equipment

Abstract

The digging tool assembly for an excavator in which the tooth tip is formed with a pin anchored by a securing ring in a recess of an adapter head which fits into the tooth base and traverses a hole in the tooth base so that the pin not only holds the tooth tip and the tooth base together but also anchors both of them to the adapter head which mounts the tool on the movable tool carrier of the excavator, e.g. a tunneling machine or a suction dredge.

We claim: 
     
       1. A digging tool assembly for an exacavator, comprising: an adapter adapted to be mounted upon said excavator and formed with an adapter head constituted as a male frustoconical plug formation, said plug formation having a recess opening at an end thereof; and   a tooth separate from said adapter but mounted thereon, said tooth comprising: a tooth base constituted as a socket formation of female frustoconical configuration form-fittingly receiving and completely enveloping said plug formation,   a tooth tip separate from but affixed to said tooth base and having a working end,   a fastening pin formed on said tooth tip on an end thereof opposite said working end and encircled by a supporting shoulder integrally formed in said tooth tip at said opposite end,   a hole formed in said tooth base in alignment with said recess and encircled by a supporting shoulder of said tooth base abutting said supporting shoulder of said tooth tip, said pin extending through said hole into said recess, and received with play in said recess and snugly received in said hole,   securing means in said recess engaging said pin for holding said assembly together, said securing means including an indexing groove formed in said pin, an indexing grooved formed in a wall of said recess, and a prestressed elastically deformable fastening ring partly received in each of said grooves and resting upon a frustoconical pressing surface engaging said ring at an acute angle to said wall,   mutually engaging complementary anti-rotation elements formed in said shoulders preventing said tip from rotating about an axis of said pin relative to said base, and   second securing means including an indexing groove formed in an outer wall of said head, an indexing groove formed in an inner wall of said base, and a prestressed elastically deformable fastening ring partly received in each of said grooves.